IMHO only:
1. Don't worry about a tuner until you find out what shoots best in your rifle. THEN, play with tuners. It will be a lot cheaper in the long run.
2. Find the most accurate ammo for your rifle by process of elimination. It will be one of the top or second shelf ammo. Don't bother with the really cheap stuff. Shoot in as near duplicate conditions re: wind and temperature as you can. Do NOT dismiss Eley red or black because you had poorer groups. Eley puts out ammo based upon speed in FPS. 1080 FPS ammo may shoot better than 1042 FPS in your rifle or maybe not. I like Eley a lot, but I will tell you it was expensive getting to the right speed for my 1913a. And then there is lot number. 1049 Lot X made in 2016 may be better for you than 1049 with different lot and year.
3. Clean your rifle carefully and well before testing another ammo. It may take 5-15 or so fouling shots that you will ignore for score, but it is necessary to not be shooting another brand's lube/wax/God knows what with your new ammo. You will be sure to get a false reading.
4. Do NOT get overly frustrated. It is a process. If the guy next to you is shooting a Lapua .338 with a muzzle suppressor, change benches away from him/her or go for a walk and come back. The blast from that cannon can knock over a full 1/2 quart bottle of whatever you have on your bench.
5. Find the most comfortable trigger pull weight for your rifle and most consistent (for your pull) trigger adjustments re: angles, cant, pull, etc.. IIRC, you can go down to 2 oz. pull on that rifle. For starters, you might feel more comfortable with something in the 5-7 oz range.
6. Make sure you mount your scope (or mount your iron sights) appropriately. Do not over tighten either and use a torque wrench for the screws. Make sure they remain at the appropriate torque before you shoot another day. Or use Locktite once everything is set up nicely.
7. HAVE FUN AND ENJOY YOUR NEW RIFLE.